_base_ = "../faster_rcnn/faster_rcnn_r50_caffe_fpn_1x_coco.py"
rpn_weight = 0.7
model = dict(
    rpn_head=dict(
        _delete_=True,
        type="CascadeRPNHead",
        num_stages=2,
        stages=[
            dict(
                type="StageCascadeRPNHead",
                in_channels=256,
                feat_channels=256,
                anchor_generator=dict(
                    type="AnchorGenerator",
                    scales=[8],
                    ratios=[1.0],
                    strides=[4, 8, 16, 32, 64],
                ),
                adapt_cfg=dict(type="dilation", dilation=3),
                bridged_feature=True,
                sampling=False,
                with_cls=False,
                reg_decoded_bbox=True,
                bbox_coder=dict(
                    type="DeltaXYWHBBoxCoder",
                    target_means=(0.0, 0.0, 0.0, 0.0),
                    target_stds=(0.1, 0.1, 0.5, 0.5),
                ),
                loss_bbox=dict(
                    type="IoULoss", linear=True, loss_weight=10.0 * rpn_weight
                ),
            ),
            dict(
                type="StageCascadeRPNHead",
                in_channels=256,
                feat_channels=256,
                adapt_cfg=dict(type="offset"),
                bridged_feature=False,
                sampling=True,
                with_cls=True,
                reg_decoded_bbox=True,
                bbox_coder=dict(
                    type="DeltaXYWHBBoxCoder",
                    target_means=(0.0, 0.0, 0.0, 0.0),
                    target_stds=(0.05, 0.05, 0.1, 0.1),
                ),
                loss_cls=dict(
                    type="CrossEntropyLoss",
                    use_sigmoid=True,
                    loss_weight=1.0 * rpn_weight,
                ),
                loss_bbox=dict(
                    type="IoULoss", linear=True, loss_weight=10.0 * rpn_weight
                ),
            ),
        ],
    ),
    roi_head=dict(
        bbox_head=dict(
            bbox_coder=dict(target_stds=[0.04, 0.04, 0.08, 0.08]),
            loss_cls=dict(type="CrossEntropyLoss", use_sigmoid=False, loss_weight=1.5),
            loss_bbox=dict(type="SmoothL1Loss", beta=1.0, loss_weight=1.0),
        )
    ),
    # model training and testing settings
    train_cfg=dict(
        rpn=[
            dict(
                assigner=dict(
                    type="RegionAssigner", center_ratio=0.2, ignore_ratio=0.5
                ),
                allowed_border=-1,
                pos_weight=-1,
                debug=False,
            ),
            dict(
                assigner=dict(
                    type="MaxIoUAssigner",
                    pos_iou_thr=0.7,
                    neg_iou_thr=0.7,
                    min_pos_iou=0.3,
                    ignore_iof_thr=-1,
                ),
                sampler=dict(
                    type="RandomSampler",
                    num=256,
                    pos_fraction=0.5,
                    neg_pos_ub=-1,
                    add_gt_as_proposals=False,
                ),
                allowed_border=-1,
                pos_weight=-1,
                debug=False,
            ),
        ],
        rpn_proposal=dict(max_per_img=300, nms=dict(iou_threshold=0.8)),
        rcnn=dict(
            assigner=dict(pos_iou_thr=0.65, neg_iou_thr=0.65, min_pos_iou=0.65),
            sampler=dict(type="RandomSampler", num=256),
        ),
    ),
    test_cfg=dict(
        rpn=dict(max_per_img=300, nms=dict(iou_threshold=0.8)),
        rcnn=dict(score_thr=1e-3),
    ),
)
optimizer_config = dict(_delete_=True, grad_clip=dict(max_norm=35, norm_type=2))
